JP2014238186A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of suppressing mutual intervention of a plurality of return cold air flows in a cooling chamber to increase a volume of the air circulating in the refrigerator, and improving cooling capability by efficiently passing the cold air through a cooler to implement heat exchange.SOLUTION: A freezing room intake port 56 for introducing air into a cooling chamber 43 is provided in a front surface of the cooling chamber 43, a high-temperature intake port 58 is provided in a back surface of the cooling chamber 43, the freezing room intake port 56 is located below the high-temperature intake port 58, a cooler lower end 44b is arranged between a high-temperature intake port upper end 58a and a high-temperature intake port lower end 58b, and a glass tube heater 59 serving as defrosting means and a heater cover 60 are arranged below the high-temperature intake port upper end 58a. It is thereby possible to suppress mutual intervention of a plurality of return cold air flows during a cooling operation, and increase a volume of the air circulating in a refrigerator, so that a cooling capability can be improved. In addition, since an area range of frost adhering to the cooler 44 can be extended, it is possible to ensure excellent frost resistance and frost adhesion performance and inhibit degradation in a cooling capability during frosting.

Description

  The present invention relates to a refrigerator structure having a high energy saving effect.

  FIG. 7 is a sectional view of a cooling chamber of a conventional refrigerator.

  As shown in FIG. 7, the refrigerator 10 has a plurality of storage rooms, and a freezing room 11 is arranged at the bottom. On the back surface of the freezer compartment 11, there is provided a cooler compartment 14 that has a cooler 12 and a blower 13 inside to generate and blow cool air. The cold air generated by the cooler 12 is forcibly sent to each storage room by the blower 13. A part is sent to the freezer compartment 11 through the cold discharge port 15, and a part is sent to the vegetable compartment 17 and the refrigerator compartment (not shown) provided above the freezer compartment 11 through the high temperature discharge air passage 16. The cold air that has cooled the freezer compartment 11 passes from the freezer compartment return port 18, and the cold air that has cooled the refrigerator compartment and the vegetable compartment 17 sequentially passes through the return port 19 and the high temperature return air passage 20, and then passes from the high temperature suction port 21 to the cooling chamber 14. It returns and is cooled again by the cooler 12. At this time, the cool air leaked from the cooler 12 to the back without being used to generate cool air is absorbed by the relatively warm return cold flowing through the high-temperature return air passage 20, so that heat does not leak from the back of the refrigerator 10 to the outside air. Power consumption can be reduced by forcibly returning the cool air of the cooler 12 to the cooling chamber 14. (For example, refer to Patent Document 1).

JP 2012-159239 A

  However, there is room for improvement in the conventional configuration. During the cooling operation, the return cold air from the freezer compartment 11 below the cooler 12 has a large backward wind speed, and the return cold air from the vegetable compartment 17 and the refrigerator compartment has a large forward wind speed, so that the flow of each other is inhibited. The cooling capacity was reduced by reducing the amount of air circulating inside.

  This invention solves the conventional subject, and it aims at providing the refrigerator with high cooling capacity by increasing the air volume which circulates the inside of a store | warehouse | chamber by suppressing the mutual interference of several return cold air.

  In order to solve the above-described conventional problems, the refrigerator of the present invention includes a cooler that generates cold air, a blower that forcibly circulates the cold air generated by the cooler, and a defrost placed below the cooler. Means, a cooling chamber containing a cooler, a blower, and a defrosting means, a low-temperature storage room provided with a cooling chamber on the back surface, at least one high-temperature storage room having a different temperature range from the low-temperature storage room, and a low-temperature storage room Equipped with a low-temperature intake port for introducing low-temperature return cold air into the cooling chamber and a high-temperature intake port for introducing high-temperature return cold air from the high-temperature storage chamber into the cooling chamber, with the low-temperature intake port in front of the cooling chamber and the high-temperature intake port in the cooling chamber Provided on the back, the lower end of the low temperature inlet is located below the lower end of the cooler, the upper end of the high temperature inlet is located above the lower end of the cooler, and the upper end of the high temperature inlet is above the defrosting means. It is arranged.

Thereby, since the high temperature return cold air from the refrigerator compartment and vegetable room where the forward speed is large easily flows to the cooler side, the freezer return cold air from the freezer compartment is shifted in the vertical direction. Therefore, the mutual interference between the high-temperature return cold air and the freezer compartment return cold air can be suppressed and the air volume circulating in the warehouse can be increased, so that the cooling capacity can be further improved. Furthermore, the lower end of the cooler is provided between the upper end and the lower end of the high temperature inlet, and the upper end of the high temperature inlet is above the defrosting means. The chiller adheres to the cooler due to moisture adhering to the food that has been put in, and moisture from the vegetables stored in the vegetable compartment, but the lower part of the back of the cooler is heated by high-temperature return cold air that contains a large amount of water. Even if the frost attached to the frost grows, the high temperature return cold air flows to the bottom surface side of the cooler, so that the frost resistance is excellent. Therefore, the deterioration of the cooling capacity at the time of frost formation can also be suppressed.

  In addition, by returning the cool air from the low temperature storage room where the greatest cooling effect is required from the lower part to the cooling room, the distance that the low temperature return cold air passes through the cooler becomes longer, and the heat exchange amount is increased to further cool the air. Ability can be improved.

  The present invention solves the conventional problem, and suppresses mutual interference of a plurality of return cold airs, thereby increasing the air volume circulating in the warehouse, increasing the cooling capacity, and naturally returning to the return air path during the defrosting operation. It aims at providing the refrigerator which suppressed the fall of the defrost efficiency by reducing the partial flow volume of a convection.

The longitudinal cross-sectional view of the refrigerator in Embodiment 1 of this invention Vertical sectional view of the cooling chamber of the refrigerator in Embodiment 1 of the present invention Detailed longitudinal cross-sectional view of the cooling chamber of the refrigerator in Embodiment 1 of the present invention Longitudinal sectional view of the refrigerator in the second embodiment of the present invention Front air path diagram of cooling room of refrigerator in embodiment 2 of the present invention Detailed longitudinal cross-sectional view of the cooling chamber of the refrigerator in Embodiment 3 of this invention Longitudinal sectional view of the cooling chamber of a conventional refrigerator

  1st invention is the cooler which produces | generates cool air, the air blower which forcibly circulates the cold air produced | generated by the cooler, the defrosting means arrange | positioned under the cooler, the cooler, the air blower, and the defrost A cooling chamber containing the means, a low-temperature storage chamber provided with a cooling chamber on the back surface, at least one high-temperature storage chamber having a temperature zone different from that of the low-temperature storage chamber, and a low temperature for introducing low-temperature return cold air from the low-temperature storage chamber into the cooling chamber It has a suction port and a high temperature suction port for introducing the high temperature return cold air from the high temperature storage chamber into the cooling chamber, the low temperature suction port is provided at the front of the cooling chamber, the high temperature suction port is provided at the back of the cooling chamber, and the lower end of the low temperature suction port Is disposed below the lower end of the cooler, the upper end of the high-temperature suction port is disposed above the lower end of the cooler, and the upper end of the high-temperature suction port is disposed above the defrosting means.

  Thereby, since the high temperature return cold air from the refrigerator compartment and vegetable room where the forward speed is large easily flows to the cooler side, the freezer return cold air from the freezer compartment is shifted in the vertical direction. Therefore, the mutual interference between the high-temperature return cold air and the freezer compartment return cold air can be suppressed and the air volume circulating in the warehouse can be increased, so that the cooling capacity can be further improved. Furthermore, the lower end of the cooler is provided between the upper end and the lower end of the high temperature inlet, and the upper end of the high temperature inlet is above the defrosting means. The chiller adheres to the cooler due to moisture adhering to the food that has been put in, and moisture from the vegetables stored in the vegetable compartment, but the lower part of the back of the cooler is heated by high-temperature return cold air that contains a large amount of water. Even if the frost attached to the frost grows, the high temperature return cold air flows to the bottom surface side of the cooler, so that the frost resistance is excellent. Therefore, the deterioration of the cooling capacity at the time of frost formation can also be suppressed.

  In addition, by returning the cool air from the low temperature storage room where the greatest cooling effect is required from the lower part to the cooling room, the distance that the low temperature return cold air passes through the cooler becomes longer, and the heat exchange amount is increased to further cool the air. Ability can be improved.

  According to a second invention, in the first invention, the low temperature suction port is positioned below the high temperature suction port.

  As a result, during cooling operation, the low-temperature return cold air having a large backward speed and the high-temperature return cold air having a large forward speed can be shifted in the vertical direction, thereby suppressing mutual interference and increasing the amount of air circulating in the warehouse. Therefore, the cooling capacity can be further improved. In addition, by returning the cool air from the low temperature storage room, which requires the greatest cooling effect, from the lower part to the cooling room, the distance that the low temperature return cold air passes through the cooler becomes longer and the heat exchange amount is increased to further increase the cooling capacity. Can be improved.

  According to a third invention, in the first or second invention, the high-temperature suction port is arranged substantially the same as the width dimension of the cooler.

  As a result, of the return cold air circulating in the refrigerator, the high temperature return cold air having the largest temperature difference from the cooler can exchange heat with the cooler with the same dimensions as the cooler width. The exchange area can be increased, and energy can be saved by improving the efficiency of the refrigeration cycle.

  In addition, since the amount of heat exchange between the high-temperature return cold air that circulates in the high-temperature storage chamber that frequently opens and closes the door while using the refrigerator and the cooler can be reduced, the time for cooling the interior can be reduced. The amount of frost formation on the cooler due to the shortening of the cooling operation time can also be reduced. In particular, the high temperature storage chamber is not only easily opened and closed by the number of times the door is opened and closed, but also because the temperature is high and the absolute humidity held in the air is high, the amount of frost attached to the cooler increases. By reducing the amount of frost formation on the cooler, it is possible to extend the defrost cycle of the cooler, reducing the number of inputs to the glass tube heater and reducing the input required for cooling the chamber after the chamber temperature rises due to defrosting. This can save energy.

  Moreover, since the heat exchange area of the cooler can be increased by improving the air path is to increase the area to be frosted on the cooler, it is possible to suppress deterioration of the cooling capacity during frosting. This makes it possible to extend the time required to operate the refrigerator and require defrosting, to reduce the number of times the glass tube heater is input and to reduce the input required for cooling the interior after the internal temperature rise due to defrosting, Further energy saving can be performed.

  In a fourth invention according to any one of the first to third inventions, the defrosting means includes a glass tube heater and a heater cover disposed above the glass tube heater, and the lower end of the high-temperature suction port is a glass tube It is located above the heater and the heater cover.

  As a result, of the return cool air circulating in the refrigerator, the high temperature return cool air having the largest temperature difference from the cooler is guided to the cooler without being interrupted by the glass tube heater and the heater cover. Furthermore, since the lower end of the high temperature suction port is located above the glass tube heater and the heater cover, the high temperature return cold air having a high temperature, high humidity and high absolute humidity is low in the cooling chamber, and The heater cover is frosted and the air path is not obstructed by the frost. In addition, high-temperature return cold air tends to be displaced upward and downward, and low-temperature return cold air tends to shift vertically, and further, mutual interference is suppressed, and the amount of air circulating in the warehouse can be increased, thereby further improving the cooling capacity. be able to.

  According to a fifth invention, in any one of the first to third inventions, the defrosting means includes a glass tube heater and a heater cover disposed above the glass tube heater, and the upper end of the low temperature suction port is a glass tube. It is located below the heater and the heater cover.

As a result, the cold air that has passed through the low-temperature return air passage and passed through the low-temperature intake port flows along the downwardly inclined air passage, so that it is below the glass tube heater and heater cover below the upper end of the low-temperature intake port. Easy to pass. Therefore, it is possible to more smoothly merge with the high-temperature return cold air flowing from the back of the cooler without reducing the speed of the low-temperature return cold air having a backward speed. as a result,
The air volume can be increased and the cooling capacity can be improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the embodiments described above, and detailed descriptions thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a longitudinal sectional view of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view of a cooling chamber according to Embodiment 1 of the present invention, and FIG. 3 is a perspective view of the refrigerator according to Embodiment 1 of the present invention. It is a detailed longitudinal cross-sectional view of a cooling chamber.

  1 to 3, a heat insulating box 31 of a refrigerator 30 is mainly composed of an outer box 32 using a steel plate and an inner box 33 formed of a resin such as ABS. A foam insulation material 34 such as urethane foam is filled and insulated from the surroundings, and is divided into a plurality of storage rooms.

  The plurality of storage rooms of the refrigerator 30 has a refrigeration room 35 at the top, a vegetable room 36 at the bottom of the refrigeration room 35, and a freezing room 37 at the bottom.

  A refrigerator compartment door 38 is opened at the front opening of the refrigerator compartment 35, a vegetable compartment door 39 is opened at the front opening of the vegetable compartment 36, and a freezer compartment door 40 is opened and closed at the front opening of the freezer compartment 37. It is supported freely.

  The refrigerator compartment 35 is normally set to 1 ° C to 5 ° C at the lower limit of the temperature at which it is not frozen for refrigerated storage, and the vegetable compartment 36 can be set to 3 to 8 ° C. The freezer compartment 37 is set in a freezing temperature zone and is usually set at −22 ° C. to −15 ° C. for frozen storage, but for example, −30 ° C. or −25 ° C. to improve the frozen storage state. It may be set at a low temperature.

  Moreover, the vegetable compartment 36 and the freezer compartment 37 are divided up and down by the 1st division wall 41 which is a partition wall, and the refrigerator compartment 35 and the vegetable compartment 36 are divided up and down by the 2nd division wall 42 which is a partition wall. Yes.

  Next, the configuration of the cooling chamber will be described.

  The cooling chamber 43 is insulated from the freezing chamber 37 by a vertical partition wall 45. A cooling chamber 43 for generating cold air is provided on the back surface of the freezing chamber 37, and a fin and tube type cold air is generated inside as a typical one. As a material, a cooler 44 using aluminum or copper is provided. It is arranged.

  The cooler 44 includes a refrigerant tube 201 in which a refrigerant flows and a plurality of plate fins 202 arranged at predetermined intervals.

The refrigerant tube 201 is a single tube made of aluminum or aluminum alloy, and the straight pipe portion and the curved pipe portion are continuous, and meandering in a row (left / right) direction X and a step (up / down) direction Y. It is a serpentine tube bent into a shape, and forms a single refrigerant flow path without using a connecting pipe that forms a curved pipe portion. And the straight pipe part of the refrigerant | coolant tube 201 becomes the structure closely_contact | adhered to the plate fin 202, when the curved pipe part of the refrigerant | coolant tube 201 penetrates the long hole 203 formed in the plate fin 202. FIG.

  The long hole 203 has a rectangular portion and a circular arc portion, and is formed in a long hole shape in which the circular arc portions are continuously formed on both short sides of the rectangular portion. Further, the arc part is provided with an edge-shaped arc part collar for tightly fixing with the straight pipe part of the refrigerant tube 201, and the edge part is also formed substantially vertically at both ends in the longitudinal direction of the rectangular part. A rectangular color is provided. The rectangular portion collar is provided with a cooler 44 so as to incline downward toward the back of the refrigerator.

  A blower 46 that forcibly blows the generated cold air is disposed above the cooler 44, and a glass tube heater 47 that defrosts frost and ice adhering to the cooler 44 is disposed below the cooler 44. Is provided. Furthermore, a drain pan 48 for receiving defrosted water generated at the time of defrosting, a drain tube 49 penetrating from the deepest part to the outside of the cabinet are configured at the lower part, and an evaporating dish 50 is configured outside the warehouse on the downstream side. .

  The glass tube heater 47 is specifically a glass tube heater 59 made of glass, and in particular, when the refrigerant is a hydrocarbon-based refrigerant gas, a double glass tube heater in which glass tubes are formed in a double manner for explosion protection is used. It has been adopted. A heater cover 60 that covers the glass tube heater 59 is disposed above the glass tube heater 59, and water drops dripped from the cooler 44 during defrosting directly fall on the surface of the glass tube that has become hot due to defrosting. The size is equal to or greater than the glass tube diameter and width so that no sound is generated.

  Here, isobutane, which is a flammable refrigerant having a low global warming potential, is used as a refrigerant in recent refrigeration cycles from the viewpoint of global environmental conservation. This hydrocarbon, isobutane, has a specific gravity of about twice that at normal temperature and atmospheric pressure (at 2.04 and 300K) compared to air. As a result, the refrigerant charge amount can be reduced as compared with the conventional case, the cost is low, and the leakage amount when the flammable refrigerant leaks is reduced, thereby improving the safety.

  In the present embodiment, isobutane is used as the refrigerant, and the maximum temperature on the surface of the glass tube, which is the outline of the glass tube heater 59 at the time of defrosting, is regulated as an explosion-proof measure. Therefore, in order to reduce the temperature of the glass tube surface, a double glass tube heater in which the glass tube is formed in a double manner is employed. In addition, as a means for reducing the temperature on the surface of the glass tube, a member (for example, an aluminum fin) having high heat dissipation can be wound around the surface of the glass tube. At this time, the outer dimensions of the glass tube heater 59 can be reduced by using a single glass tube.

  In addition to the glass tube heater 59, a pipe heater that is in close contact with the cooler 44 may be used as a means for improving the efficiency during defrosting. In this case, the defrosting of the cooler 44 is efficiently performed by direct heat transfer from the pipe heater, and the frost adhering to the drain pan 48 and the blower 46 around the cooler 44 can be melted by the glass tube heater 59. Therefore, the defrosting time can be shortened, and an increase in the internal temperature during energy saving and defrosting time can be suppressed.

  When the glass tube heater 59 and the pipe heater are combined, the capacity of the glass tube heater 59 can be reduced by optimizing the heater capacities of each other. If the heater capacity is lowered, the outer temperature of the glass tube heater 59 at the time of defrosting can also be lowered, so that red heat at the time of defrosting can also be suppressed.

The drain pan 48 constitutes a part of the bottom surface and the back surface of the cooling chamber 43. The bottom surface is configured to have the lowest connection portion with the drain tube 49 in order to collect the defrosted water in the drain tube 49, and is farthest from the glass tube heater 47 at the connection portion with the drain tube 49 (distance L). It will be. The back surface rises to a height that exceeds the height at which the amount of water stored in the drain pan 48 can be secured, and the angle formed between the bottom surface and the back surface is a gently curved surface.

  Next, the air path configuration will be described.

  The vertical partition wall 45 includes a front partition wall 45 a that forms the outer shell of the freezing chamber 37 and a rear partition wall 45 b that forms the outer shell of the cooling chamber 43. A space between the front partition wall 45a and the rear partition wall 45b is a distribution air passage 51 that branches cold air toward each storage chamber.

  The front partition wall 45 a has a freezer compartment discharge port 52 on the upper side, and communicates the distribution air passage 51 and the freezer compartment 37. There is a freezer return air passage 53 protruding downward from the freezer compartment 37 side, and the return cold air from the freezer compartment 37 is introduced into the cooling chamber 43 through an inlet 53a provided in front of the freezer return air passage 53.

  The distribution air passage 51 is also connected to a high temperature discharge air passage 54 provided in the first partition wall 41. Further, the high temperature discharge air passage 54 is connected to the refrigerator compartment 35 and the vegetable compartment 36.

  The rear partition wall 45 b includes a blower 46 on the upper side, and has a rib 55 that partitions the freezer return air passage 53 and the cooling chamber 43 on the lower side. A region surrounded by the freezing chamber return air passage 53 by the rib 55 and the drain pan 48 is a freezing chamber suction port 56, and the freezer compartment return air passage 53 and the cooling chamber 43 communicate with each other.

  The area of the freezer compartment inlet 56 is configured to be larger than the area of the inlet 53a. Further, in the longitudinal section passing through the center of the drain tube 49, the distance L between the glass tube heater 47 and the drain tube 49 is configured to be larger than the height H of the freezer compartment suction port 56 in the same longitudinal section. . Further, the distance B between the back surface of the cooling chamber 43 and the glass tube heater 47 is also configured to be larger than the height H of the freezer compartment suction port 56.

  The bottom surface of the freezing chamber return air passage 53 is constituted by a part of the drain pan 48 and the bottom surface of the cooling chamber 43. The drain pan 48 starts from the lower end of the inlet 53a, passes through the lower end of the freezing chamber suction port 56, inclines downward to the drain tube 49, and then gradually turns upward to connect to the back surface of the cooling chamber 43.

  A high-temperature return air passage 57 is disposed on the back surface of the cooler 44. It passes through the first partition wall 41 and the second partition wall 42 and communicates with the vegetable compartment 36 and the refrigeration compartment 35, respectively, and the cold air that has cooled the refrigeration compartment 35 and the vegetable compartment 36 merges in the high-temperature return air passage 57. . The high temperature return air passage 57 includes a high temperature suction port 58 that communicates with the cooling chamber 43 below.

  The freezer compartment suction port 56 is provided on the front surface of the cooling chamber 43, and the high temperature suction port 58 is provided on the back surface of the cooling chamber 43. The freezer compartment suction port 56 is disposed below the lower end of the cooler 44. The upper end of the port 58 is disposed above the lower end of the cooler 44, and the upper end of the high temperature suction port 58 is disposed above the glass tube heater 47.

  Further, the freezer compartment suction port 56 is configured to be positioned below the high temperature suction port 58.

  Further, a high-temperature suction port 58 on the back side of the cooler, which is an inflow portion of the return cold air from the refrigerator compartment 35 and the vegetable compartment 36, is arranged substantially the same as the width dimension of the cooler.

  The glass tube heater 47 includes a glass tube heater 59 and a heater cover 60 disposed above the glass tube heater 59, and the lower end of the high temperature suction port 58 is located above the glass tube heater 59 and the heater cover 60. ing.

  The glass tube heater 47 includes a glass tube heater 59 and a heater cover 60 disposed above the glass tube heater 59, and the upper end of the freezer compartment inlet 56 is positioned below the glass tube heater 59 and the heater cover 60. doing.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the cooling operation will be described.

  A part of the cold air generated by the cooler 44 in the cooling chamber 43 is forcibly blown forward by the blower 46 in the distribution air passage 51. The freezer compartment 37 is cooled by the cold air discharged from the freezer compartment discharge port 52, and the cold air is below the cooler 44 from the freezer compartment suction port 56 via the freezer return air passage 53 provided at the lower part of the vertical partition wall 45. Then, heat is exchanged in the cooler 44, and fresh cold air is circulated again by the blower 46. As a result, the freezer compartment 37 is cooled to an appropriate temperature under the control of a freezer sensor (not shown).

  Further, the cold air discharged upward in the distribution air passage 51 is discharged to the refrigerator compartment 35 and the vegetable compartment 36 through the high temperature discharge air passage 54 in the first partition wall 41. The circulated cold air becomes the air in the refrigerator compartment 35 and the vegetable compartment 36 and the humid air contained in the stored product, passes through the high temperature return air passage 57 and is led to the lower part of the cooler 44 through the high temperature suction port 58. Heat is exchanged with the cooler 44, and fresh cool air is forcibly blown again by the blower.

  Thereby, even if the refrigerator compartment 35 and the vegetable compartment 36 are in the position away from the cooler 44, the room can be cooled to the set temperature by forcibly circulating the cool air by the blower 46.

  Here, an open / close valve (not shown) for adjusting the amount of cold air may be provided in the air passage of the vegetable compartment discharge air passage (not shown) for introducing cold air into the vegetable compartment 36. In this case, since the temperature in the vegetable compartment 36 can be precisely controlled by the opening / closing valve, for example, the temperature fluctuation in the warehouse is suppressed even during the summer or when the door is excessively opened and closed during food storage. It can be maintained at an appropriate temperature.

  Further, since the glass tube heater 47 can heat the inside of the cooling chamber 43 and the inside of the high temperature return air passage 57 with the heater heat at the time of defrosting, it can improve and prevent condensation and freezing, and can improve reliability.

  Here, the suction air passage configuration will be described.

  When the cold air discharged from the blower 46 circulates through all the storage rooms of the refrigerating room 35, the vegetable room 36, and the freezing room 37, the cooling room 43 includes the return cold air from the freezing room 37, the refrigerating room 35, and Two flows of hot return cold air from the vegetable compartment 36 will flow in simultaneously.

  The return cold air from the freezer compartment 37 passes through the freezer compartment return air passage 53 from the entrance 53 a and enters the cooling compartment 43 from the freezer compartment suction port 56. The high temperature return cold air from the refrigerator compartment 35 and the vegetable room 36 passes through the high temperature return air passage 57 and enters the cooling chamber 43 from the high temperature suction port 58.

In the present embodiment, the freezer compartment suction port 56 is provided on the front surface of the cooling chamber 43, the high temperature suction port 58 is provided on the rear surface of the cooling chamber 43, and the high temperature suction port lower end 58 b is the lower end of the cooler 44.
4b, the high temperature suction port upper end 58a is located above the cooler lower end 44b, which is the lower end of the cooler 44, and the high temperature suction port upper end 58a is a glass tube heater 59 and a glass tube for defrosting. It covers the heater 59 and is positioned above the upper heater cover 60.

  Thereby, in the cooling chamber 43, the cooler lower end 44b is disposed between the high temperature suction port upper end 58a and the high temperature suction port lower end 58b, and the high temperature suction port upper end 58a is a glass tube heater 59 and a heater for defrosting. Since it is positioned above the cover 60, the high-temperature return cold air from the refrigerating room 35 and the vegetable room 36, which has a large forward speed, easily flows to the cooler 44 side. Is shifted vertically. Therefore, the mutual interference between the high-temperature return cold air and the freezer compartment return cold air can be suppressed and the air volume circulating in the warehouse can be increased, so that the cooling capacity can be further improved.

  In addition, by returning the cool air from the low temperature storage room where the greatest cooling effect is required from the lower part to the cooling room, the distance that the low temperature return cold air passes through the cooler becomes longer, and the heat exchange amount is increased to further cool the air. Ability can be improved.

  When the high temperature suction port upper end 58a and the high temperature suction port lower end 58b are located below the cooler 44, the air flow resistance of the high temperature return air channel 57 increases and the circulating air volume decreases, so that the cooling capacity decreases. On the other hand, when the high-temperature suction port upper end 58a and the high-temperature suction port lower end 58b are located above the cooler 44, the air path resistance decreases and the circulation air volume increases, but the frost is attached to the cooler 44 because the cool air easily flows. In this embodiment, the cooler lower end 44b is disposed between the high temperature suction port upper end 58a and the high temperature suction port lower end 58b, thereby cooling the high temperature return air passage 57. It is configured to satisfy both capacity and frost resistance. In particular, optimization of both the cooling capacity and the frosting resistance is achieved by disposing the high temperature suction port upper end 58a between the lowermost pipe of the cooler 44 and the pipe one stage higher than the lowermost stage.

  In addition, frost adheres to the cooler 44 due to moisture in the air that has entered when the door is opened, moisture adhering to food put in the cabinet, moisture from vegetables stored in the cabinet, and the like. To do. When this frost grows, the heat exchange efficiency is lowered between the cooler 44 and the circulating cold air, and the inside of the cabinet cannot be cooled sufficiently, and finally becomes uncooled or slowly cooled. Therefore, in the refrigerator, it is necessary to periodically defrost the frost adhering to the cooler 44. However, as in the present embodiment, the cooler is disposed between the high temperature inlet upper end 58a and the high temperature inlet lower end 58b. By providing the lower end 44b, even if frost attached to the lower part of the back of the cooler grows due to the high temperature return cold air having a large moisture content, the high temperature return cold air flows to the cooler bottom surface side, so that the anti-frosting performance is improved. Therefore, the deterioration of the cooling capacity at the time of frost formation can also be suppressed.

  In the cooling chamber 43, the long holes 203 of the plate fins 202 and the rectangular collar 203b are installed in the cooler 44 so as to incline downward toward the back of the refrigerator. A vertically upward component mainly enters from the back side, and a part of the entering cool air flows along the plate fins 202 and the rectangular collar 203 b of the cooler 44 and is guided to the front of the cooler 44. Thereby, since the amount of heat exchange can be increased by passing the cool air through the entire cooler 44, the cooling capacity can be improved.

  Further, the shape of the drain pan 48 constituting the bottom surface of the cooling chamber 43 has a shape inclined downward from the freezing chamber suction port 56 to the drain tube 49, so that the freezing chamber return cold air flows downward along the drain pan 48. Since it can be raised along the rear rear surface, the speed of the freezer compartment return cold air is directed upward in front of the high temperature suction port 58, and can smoothly merge with the high temperature return cold air, and the air capacity can be further increased and the cooling capacity can be improved.

The freezer compartment suction port 56 includes a freezer compartment return air passage 53 on the upstream side, and the freezer compartment return air passage 53.
The inlet 53a is positioned above the freezer compartment suction port 56, so that the freezer return cold air at the freezer compartment suction port 56 flows downward into the cooler chamber 43, so that it easily flows along the drain pan 48. Interference with low-temperature return cold air can be suppressed while further reducing pressure loss. Furthermore, since the area of the inlet 53a of the freezer return air passage 53 is smaller than the area of the freezer compartment inlet 56, pressure loss at the freezer compartment inlet 56 can be further reduced.

  Further, a high-temperature suction port 58 on the back side of the cooler, which is an inflow portion of the return cold air from the refrigerator compartment 35 and the vegetable compartment 36, is arranged substantially the same as the width dimension of the cooler.

  As a result, in the return cold air circulating in the refrigerator, the high temperature return cool air in which the cooler room return cold air and the vegetable room return cold air having a large temperature difference with the cooler 44 is combined with the cooler 44 for heat exchange with the cooler width. Therefore, it is possible to increase the heat exchange area in the cooler 44 and to save energy by improving the refrigeration cycle efficiency.

  Furthermore, in the use state of the refrigerator, the number of times of opening and closing the doors of the refrigerator compartment 35 and the vegetable compartment 36 is large. In particular, in recent years, the vegetable room 36 is also actually storing cold plastic bottles other than vegetables, and the number of times of opening and closing the doors of the refrigerated room 35 and the vegetable room 36 within a day is increasing compared to 10 years ago. Therefore, since the amount of heat exchange between the high-temperature return cold air circulating through the high-temperature storage chambers of the refrigerator compartment 35 and the vegetable compartment 36 and the cooler as described above increases the time for cooling the inside of the refrigerator, The amount of frost formation on the cooler 44 due to the shortening of the cooling operation time can also be reduced. In particular, the high temperature storage chamber is not only easy to infiltrate the moisture of the outside air due to the large number of times of opening and closing the door, but also because the temperature is high and the absolute humidity held in the air is high, the amount of frost adhering to the cooler 44 also increases. . By reducing the amount of frost formation on the cooler 44, it is possible to extend the defrost cycle of the cooler 44, and it is necessary for reducing the number of input times of the glass tube heater 47 and cooling the interior after the interior temperature rise due to defrosting. Input can be reduced and further energy saving can be achieved.

  Further, the fact that the heat exchange area in the cooler 44 can be increased is that the area to be frosted on the cooler 44 is increased, so that deterioration of the cooling capacity during frost formation can also be suppressed. As a result, it is possible to extend the time (defrost cycle) until defrosting is required after the refrigerator is operated, and the inside of the cabinet after the number of times of input of the glass tube heater 47 and the rise in the inside temperature due to defrosting. The input required for cooling can be reduced, and further energy saving can be performed.

  The high temperature suction port lower end 58b, which is the lower end of the high temperature suction port 58, is located above the glass tube heater 59 and the heater cover 60 for defrosting.

  As a result, of the return cool air circulating in the refrigerator, the high temperature return cool air having the largest temperature difference from the cooler is guided to the cooler 44 without being interrupted by the glass tube heater 59 and the heater cover 60. . Further, the fact that the lower end 58b of the high temperature suction port is located above the glass tube heater 59 and the heater cover 60 means that the high temperature return cold air having a high humidity and a high absolute humidity is caused by the refrigeration temperature and the moisture evaporated from the outside air and vegetables. The glass tube heater 59 and the heater cover 60 that are at a low temperature in the cooling chamber are frosted, and the air path is not obstructed by the frost. In addition, high-temperature return cold air tends to be displaced upward and downward, and low-temperature return cold air tends to shift vertically, and further, mutual interference is suppressed, and the amount of air circulating in the warehouse can be increased, thereby further improving the cooling capacity. be able to.

  In addition, the freezer compartment suction port upper end 56 a, which is the upper end of the freezer compartment suction port 56, is located below the glass tube heater 59 and the heater cover 60 for defrosting.

As a result, the cold air that has passed through the freezer return air passage 53 and passed through the freezer inlet 56 flows along a downwardly inclined air passage, so that the glass tube heater 59 below the freezer compartment inlet upper end 56a. And easily passes under the heater cover 60. Therefore, it is possible to more smoothly merge with the high-temperature return cold air flowing from the back of the cooler 44 without reducing the speed of the freezer return cold air having a backward speed. As a result, the air volume can be increased and the cooling capacity can be improved.

  Since the refrigerator 30 needs to cool the freezer compartment 37 having the largest temperature difference from the outside temperature among the three storage rooms, the refrigerator 30 can be frozen by closing the high-temperature discharge air passage 54 with an on-off valve (not shown). It is necessary to circulate cold air only to the chamber 37. When the cool air discharged from the blower 46 circulates only in the freezer compartment 37, only the return cool air from the freezer compartment 37 flows into the cooler chamber 43.

  At this time, the freezer return cold air passes through the freezer return air passage 53 from the entrance 53a and enters the cooling chamber 43 through the freezer inlet 56, as in the case where the cold air circulates in all the storage rooms. It passes under the heater 47 and enters the cooler 44 along the drain pan 48 from the back surface. Therefore, the freezer return cold air can flow diagonally in the cooler 44, and the heat exchange distance can be increased, so that the heat exchange amount can be increased and the cooling capacity can be improved.

  Furthermore, since the suction port installed on the front surface of the cooling chamber 43 is only the freezing chamber suction port 56, the width of the freezing chamber suction port 56 can be expanded to the same as the width of the cooler 44. Therefore, even when the cold air is circulating only in the freezer compartment 37, the entire cooler 44 can be used, and the cooling capacity can be further improved.

  Further, since the freezer compartment suction port 56 is larger than the inlet 53a of the freezer compartment return air passage 53, the pressure loss can be suppressed and the air volume can be increased.

  In general, the cooler 44 having the lowest temperature in the refrigerator is disposed on the back of the refrigerator 30, so that the amount of heat entering through the heat insulating wall on the back is maximum in the refrigerator. Since the high-temperature return air passage 57 is configured between the heat insulating wall and the heat insulating wall, the amount of heat entering through the heat insulating wall on the back surface of the refrigerator 30 can be effectively reduced.

  Further, the cold air cooled by the cooler 44 spreads around it by heat transfer, but the return cold air from the refrigerator compartment 35 and the vegetable compartment 36 passes through the high-temperature return air passage 57 installed on the back surface of the cooler 44. When flowing, the cool air leaked from the cooler 44 is absorbed and returned to the cooling chamber 43 again, so that the cool air leakage to the outside of the refrigerator 30 can be suppressed and the power consumption can be reduced.

(Embodiment 2)
FIG. 4 is a longitudinal sectional view of the refrigerator in the second embodiment of the present invention, and FIG. 5 is a front view of the cooling chamber in the second embodiment of the present invention.

  In addition, although description is abbreviate | omitted about the part which can apply the structure similar to Embodiment 1, and the same technical idea, as long as there is no malfunction, it can apply combining this Embodiment with the structure of Embodiment 1. Is possible.

  4 and 5, the plurality of storage rooms of the refrigerator 30 has a refrigeration room 35 at the top, a vegetable room 36 at the bottom, and a freezing room 37 between the refrigeration room 35 and the vegetable room 36.

  Moreover, the vegetable compartment 36 and the freezer compartment 37 are divided up and down by the 1st division wall 71 which is a partition wall, and the refrigerator compartment 35 and the freezer compartment 37 are divided up and down by the 2nd division wall 72 which is a partition wall. Yes.

  The distribution air passage 51 is connected to a vegetable room discharge air passage (not shown) provided in the first partition wall 71 and communicates the distribution air passage 51 and the vegetable compartment 36. In addition, the distribution air passage 51 and the refrigerating chamber 35 are communicated with each other by connecting to a refrigerating chamber discharge air passage 85 provided in the second partition wall 72.

  A refrigeration chamber return air passage 87 is disposed on the back surface of the cooler 44. The refrigeration chamber return air passage 87 passes through the second partition wall 72 and communicates the refrigeration chamber 35 and the cooling chamber 43, and cold air that has cooled the refrigeration chamber 35 flows therethrough. The refrigerating room return air passage 87 includes a refrigerating room suction port 88 communicating with the cooling room 43 below.

  In addition, the rear surface of the cooling chamber 43 has a vegetable chamber suction port 89 next to the refrigeration chamber suction port 88. The vegetable room suction port 89 communicates with the vegetable room 36 via a vegetable room return air passage 90 provided in the first partition wall 71.

  The refrigerator compartment suction port 88 and the vegetable compartment suction port 89 are provided in the vicinity of the lower end of the cooler 44 and are configured at a position higher than the freezer compartment suction port 56.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The cold air discharged upward in the distribution air passage 51 is discharged to the refrigerating chamber 35 through the refrigerating chamber discharge air passage 84 in the second partition wall 72. The cold air that has cooled the inside of the refrigerating chamber 35 becomes humid air, passes through the refrigerating chamber return air passage 87, is led from the refrigerating chamber suction port 88 to the lower part of the cooler 44, and is heat exchanged and dehumidified with the cooler 44. Fresh cool air is forcibly blown by the blower 46 again.

  Further, the cold air discharged to the inside of the distribution air passage 51 is discharged to the vegetable compartment 36 through the vegetable compartment discharge air passage 84 in the first partition wall 71. The cold air that has cooled the inside of the vegetable compartment 36 becomes humid air, passes through the vegetable compartment return air passage 90, is led from the vegetable compartment suction port 89 to the lower part of the cooler 44, and is heat-exchanged and dehumidified with the cooler 44. The fresh cold air is forced to be blown again by the blower.

  The refrigerated room return cold air from the refrigeration room 35 flows downward in the refrigeration room return air passage 87, but the high temperature is installed on the back surface of the cooling room 43 by changing the direction forward on the lower surface of the refrigeration room return air passage 87. It flows into the cooling chamber 43 from the suction port 58.

  The cold room return cold air that has come out of the cold room suction port 88 merges with the freezer compartment return cold air that has risen along the back surface of the cooling chamber 43. The cold air returning from the refrigerator compartment is pushed by the upward freezing room return air, smoothly turning upward, and can enter the cooler 44 together with the freezing room return cold air.

  On the other hand, since the vegetable room return cold air from the vegetable room 36 flows upward in the vegetable room return air passage 90, the vegetable room return cold air that has come out from the vegetable room suction port 89 runs along the back of the cooling room 43. The freezing room return cold air that has come up can smoothly merge and enter the cooler 44 together with the freezing room return cold air.

  Here, since the refrigerator compartment inlet 88 and the vegetable compartment inlet 89 are arranged side by side, they do not interfere with each other in the cooling chamber 43 that flows upward.

  Even when the refrigeration room suction port 88 and the vegetable room suction port 89 are arranged one above the other according to the air path configuration, since all the flows are directed upward in all the cooling chambers 43, they interfere with each other and reduce the air volume. I will not let you.

  Accordingly, since all the return cold air does not interfere with each other, the amount of heat exchange of the cooler 44 can be increased by increasing the amount of circulating air, and the cooling capacity can be improved.

  As described above, in the present embodiment, the freezer compartment suction port 56 is provided on the front surface of the cooling chamber 43, the refrigerator compartment suction port 88 and the vegetable compartment suction port 89 are provided on the back surface of the cooling chamber 43, and the freezer compartment suction port 56 is provided in the refrigerator compartment. The lower end of the cooler is located below the suction port 88 and the vegetable room suction port 89, and is located between the refrigeration room suction port upper end 88a, the vegetable room suction port upper end 89a, the refrigeration room suction port lower end 88b, and the vegetable room suction port lower end 89b. 44b is provided, and the upper end 88a of the cold air refrigeration chamber suction port and the upper end 89a of the vegetable chamber suction port are positioned above the glass tube heater 59 and the upper heater cover 60 for defrosting. The high-temperature return cold air from the large refrigerator compartment 35 and vegetable compartment 36 easily flows to the cooler 44 side, so that the freezer return cold air from the freezer compartment 37 is shifted in the vertical direction. Therefore, the mutual interference between the high-temperature return cold air and the freezer compartment return cold air can be suppressed and the air volume circulating in the warehouse can be increased, so that the cooling capacity can be further improved.

  In addition, by returning the cool air from the low temperature storage room where the greatest cooling effect is required from the lower part to the cooling room, the distance that the low temperature return cold air passes through the cooler becomes longer, and the heat exchange amount is increased to further cool the air. Ability can be improved.

  Therefore, even when the refrigeration room return air path 87 and the vegetable room return air path 90 are independent, an effect excellent in energy saving can be obtained by improving the cooling capacity.

(Embodiment 3)
FIG. 6 is a detailed longitudinal sectional view of the cooling chamber of the refrigerator in the third embodiment of the present invention.

  In addition, although description is abbreviate | omitted about the part which can apply the structure similar to Embodiment 1, and the same technical idea, as long as there is no malfunction, it can apply combining this Embodiment with the structure of Embodiment 1. Is possible.

  As shown in FIG. 6, a freezer compartment suction port 56 is disposed on the front surface of the cooler 44, a high temperature return air passage 57 is disposed on the rear surface, a high temperature suction port upper end 58 a that is the upper end of the high temperature return air passage 57, and a high temperature A cooler lower end 44b, which is the lower end of the cooler 44, is disposed between the high temperature suction port lower end 58b, which is the lower end of the return air passage 57, and the high temperature suction port upper end 58a is a glass tube heater 59 for defrosting and a glass tube heater. In the configuration that covers 59 and is positioned above the upper heater cover 60, the heater cover 60 is disposed so as to be inclined downward in the front-rear direction toward the back side of the cooler 44, that is, toward the high-temperature return air passage 57.

  As a result, the cold air flowing through the high temperature return air passage 57 and flowing from the high temperature suction port 58 to the cooler 44 and the freezing chamber suction port 56, passing under the glass tube heater 59 and then flowing upward. The return air from the chamber flows smoothly and efficiently into the cooler 44 with the heater cover 60 as a guide, and the heat exchange efficiency with the cooler 44 is improved without increasing the air path pressure loss in the cooling chamber 43. And the cooling capacity is improved. As a result, a refrigerator excellent in energy saving can be provided.

  In addition, the heater cover 60 is inclined in the front-rear direction of the cooler 44, and the end surface of the heater cover 60 on the near side is raised with respect to the inside of the refrigerator. Thereby, the warm air heated by the glass tube heater 59 at the time of defrosting easily rises upward, and the defrosting efficiency can be improved.

Even in the case where the end surface of the heater cover 60 is tilted upward as in the present embodiment, the position of the freezer compartment suction port upper end 56a, which is the upper end of the freezer compartment suction port 56, is a glass tube heater. 59 and the heater cover 60 are disposed below, so that red heat at the time of defrosting can be made invisible. Therefore, when the freezer compartment door is opened at the time of defrosting of the refrigerator, the red heat of the glass tube heater 59 is also generated. Does not give anxiety to the user.

  As described above, the configuration of the refrigerator according to the present invention can improve the heat exchange amount of the cooler without increasing the pressure loss of the air passage. It can also be applied to equipment that circulates heat to exchange heat.

30 Refrigerator 35 Refrigerated room (high temperature storage room)
36 Vegetable room (high temperature storage room)
37 Freezer room (cold storage room)
43 Cooling chamber 44 Cooler 44b Cooler lower end 46 Blower 47 Glass tube heater 48 Drain pan (bottom of cooling chamber)
53 Freezer return air passage 53a Entrance 56 Freezer compartment inlet (low temperature inlet)
56a Freezer compartment inlet top (low temperature inlet top)
58 High temperature inlet 58a High temperature inlet upper end 58b High temperature inlet lower end 59 Glass tube heater 60 Heater cover 201 Refrigerant tube 202 Plate fin 203 Long hole

Claims (5)

A cooler that generates cold air, a blower that forcibly circulates the cold air generated by the cooler, a defrosting unit disposed below the cooler, the cooler, the blower, and a defrosting unit. A cooling chamber to be stored, a low-temperature storage chamber provided with the cooling chamber on the back surface, at least one high-temperature storage chamber having a temperature zone different from that of the low-temperature storage chamber, and a low temperature for introducing the low-temperature return cold air from the low-temperature storage chamber into the cooling chamber In a refrigerator comprising a suction port and a high temperature suction port for introducing high temperature return cold air from the high temperature storage chamber into the cooling chamber, the low temperature suction port is provided on the front surface of the cooling chamber, and the high temperature suction port is provided on the back surface of the cooling chamber. The lower end of the low temperature inlet is disposed below the lower end of the cooler, the upper end of the high temperature inlet is disposed above the lower end of the cooler, and the upper end of the high temperature inlet is the defrosting means. Than Refrigerator, characterized in that it is disposed towards. The refrigerator according to claim 1, wherein the low-temperature suction port is positioned below the high-temperature suction port. The refrigerator according to claim 1 or 2, wherein the high-temperature suction port is arranged substantially the same as the width dimension of the cooler. The defrosting means includes a glass tube heater and a heater cover disposed above the glass tube heater, and a lower end of the high temperature suction port is located above the glass tube heater and the heater cover. The refrigerator according to any one of claims 1 to 3. The defrosting means includes a glass tube heater and a heater cover disposed above the glass tube heater, and an upper end of the low-temperature suction port is located below the glass tube heater and the heater cover. The refrigerator according to any one of claims 1 to 3.

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